[alsa-devel] [PATCH 1/2] ASoC: rt5663: Add documentation for power supply support

[Mark Brown]

On Thu, Nov 15, 2018 at 12:13:33PM +0800, Cheng-Yi Chiang wrote:

> +++ b/Documentation/devicetree/bindings/sound/rt5663.txt
> @@ -36,6 +36,9 @@ Optional properties:
>    "realtek,impedance_sensing_num" is 2. It means that there are 2 ranges of
>    impedance in the impedance sensing function.
>  
> +- avdd-supply: Power supply for AVDD, providing 1.8V.
> +- cpvdd-supply: Power supply for CPVDD, providing 3.5V.
> +

These should be mandatory properties, the device is going to need power
to work.  The regulator API will handle incompletely specified boards
for you, that's not a problem.
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